NASA just filmed a 'potentially hazardous' asteroid flying near Earth that's as big as a super-tall skyscraper

An illustration of a near-Earth object, or NEO, passing near Earth.NASA

Astronomers are taking radar images of a "potentially hazardous asteroid" named 2014 JO25.

The space rock looks like a peanut and may be as big as some of the tallest skyscrapers on Earth.

It will safely fly past Earth on Wednesday, April 19.

NASA recently turned down a new asteroid-hunting telescope to find threatening objects.

Astronomers on Wednesday night will be keeping a close eye on a big asteroid that's zooming past Earth.

Telescopes like the Arecibo Observatory — a huge radio dish built inside of a Puerto Rican sinkhole — have already started filming the tumbling space rock, called 2014 JO25. They are pinging the asteroid with radar and recording the echoes.

Below is one of the first radar videos that astronomers took of the asteroid using Arecibo on April 17.

What we know about asteroid 2014 JO25

Astronomers discovered the object about 3 years ago.

Because it will fly so close to Earth, it has earned the label of a "potentially hazardous asteroid," or PHA. However, NASA says 2014 JO25 "will fy safely past Earth" and isn't due to swing by again for more than 400 years.

NASA's Deep Space Network antenna at Goldstone, California, took these images of asteroid 2014 JO25.NASA/JPL-Caltech/GSSR
The rock is estimated to be about 2,000 feet across, NASA said in . That's roughly between the height of the One World Trade Center in New York City and Shanghai Tower in China — two "super-tall" skyscrapers that are among the largest human-made buildings on Earth.

But Edgard Rivera-Valentín, a planetary scientist with the Universities Space Research Association who studies Arecibo data, said it may actually be much larger than that.

"Arecibo revealed that this object ... is shaped like a peanut," Rivera-Valentín told Business Insider in an email.

He added that Arecibo and other radar observatories will take their best photos on Wednesday night. "A little bit more time is needed to clearly get the asteroid's shape," Rivera-Valentín said.

NASA's Deep Space Network antenna at Goldstone, California, also recorded the asteroid a day later, on April 18. The 230-foot-wide dish photographed the 30 radar images of the space rock (above) as it hurled toward the vicinity of Earth from about 1.9 million miles away.

Astronomers then turned those images into a sped-up movie:

Defending Earth from killer asteroids

The rock's "peanut" shape comes from the fact that it's a "contact binary," the term for when two rocks smoosh together in space.

Rivera-Valentín previously told Business Insider that contact binaries make up about one in every six space rocks, which makes them very common leftovers of our solar system's formation.

Rivera-Valentín said it's vital to make movies of these near-Earth objects (NEOs) as they coast through our neighborhood, since there's always a good degree of uncertainty about their future paths — at least after optical telescopes first spot them.

The Arecibo Radio Telescope began collecting data for SETI in 1999.Uploaded to Wikipedia by File Upload Bot (Magnus Manske)
"Arecibo goes beyond acting as a fortune teller, we can characterize these objects," he previously said. "We can study their size, shape, spin state, composition, and near-surface geology."

The ultimate goal is to feed such data into advanced simulations and estimate just how big of a threat a particular hazardous space rock poses to humanity.

"An asteroid impact, unlike other natural catastrophes, can actually be avoided. The data from Arecibo can be used by NASA to inform a planetary defense mission," he said.

A "planetary defense" mission may sound like the plot of a science fiction blockbuster, but NASA is deadly serious about tracking and preparing for killer asteroids. The space agency even has a mandate from Congress to find 90% of an estimated 300,000 NEOs big enough to wipe a large city off the map.

Space rocks that are capable of such devastation pass by us with worrisome frequency. In fact, the typical American is about 30 times more likely to die from a regional asteroid strike during their lifetimes than a refugee terrorist attack, according to a recent data analysis by Business Insider.

In a previous email to Business Insider, NASA officials said they intend to fund the NEOCam mission, though only partially through 2017 — presumably long enough to track down full funding for the mission, and a rocket on which to launch it.

"The NEOCAM project is working to identify activities that could be done this year that would reduce the technical, schedule, and cost risk of a future mission," David Schurr, the deputy director of NASA's planetary science program, previously wrote.

Correction: Edgard Rivera-Valentín previously told Business Insider that asteroid 2014 JO25 may be "twice as big as originally estimated," but he later said newer data from NASA's Jet Propulsion Laboratory has ruled this out. The asteroid is most likely about 2,000 feet across.